Physicomechanical and design characteristics of surface high-entropy alloys

Abstract

We investigated the phase composition of high-entropy shape memory alloys CoCuTiZrHf, NiCoTiZrHf, NiCuTiZrHf, ZrCuNiCoTi, TiNiZrHfCoCu after HVOF, thermomechanical treatment and thermal cycling. We have also developed criteria for calculating the energy capacity, enthalpy, entropy, theoretical strength of high-entropy alloys, taking into account the chemical composition and structural-phase state according to the results of X-ray phase analysis. We proposed a criterion for assessing the damageability of high-entropy alloys. The article describes calculations of energy consumption, entropy, enthalpy, theoretical strength of high-entropy alloys CoCuTiZrHf, NiCoTiZrHf, NiCuTiZrHf, ZrCuNiCoTi, TiNiZrHfCoCu both after HVOF and after thermomechanical treatment. After full-scale mechanical tests of surface-modified layers of high-entropy materials for bending with rotation, we obtained experimental values of cyclic durability and plotted fatigue curves. The calculated assessment of the cyclic durability was carried out according to the developed mathematical criteria. We calculated the damageability of high-entropy alloys and constructed the graphical curves of the dependence of the damageability on the cyclic life.

Development and Research of New Hybrid Composites in Order to Increase Reliability and Durability of Structural Elements

“…During operation, materials must withstand high specific loads, sliding speeds, and thermal and force deformations. They must also have sufficient mechanical strength, friction coefficient stability, run-in resistance, seizing resistance, high wear resistance, corrosion resistance, and low cost [15,16,21,22].…”

“…In order to ensure the multifunctionality of a surface composition operating under conditions of cyclic loading and reverse friction, it is important to correctly design its outer layers. These layers perceive external influences as, for example, does a layer of increased wear resistance [2,15,16,21,22]. In Table 3, we have shown one of the options for a composite surface layer for operation in cyclic loading and reverse friction.…”

“…High-entropy materials and ceramic wear-resistant materials as surface layers [3][4][5][6][7][8][9][10][11][12][13] or as part of surface composites [14][15][16][17][18][19][20] ensure an effective response to external factors and adaptation to external influences. High-energy technologies provide nanostructuring.…”

“…They include high-entropy layers and ceramic wear-resistant layers [2], which are formed using a multifunctional technological complex. The technologies for surface-layered composites are mainly used to improve the properties of products [14][15][16][17][18][19][20][21]. Layered surface composites that have a range of properties are relevant for various industries (oil and gas, aerospace, mechanical engineering, etc.).…”

ИССЛЕДОВАНИЕ СТРУКТУРЫ И МЕХАНИЧЕСКИХ СВОЙСТВ ВЫСОКОЭНТРОПИЙНЫХ ЖАРОПРОЧНЫХ ИЗНОСОСТОЙКИХ КОМПОЗИЦИЙ TiNiZrHfCoCu-cBNCoNiAlY

“…Целью настоящей работы является исследование возможностей конструирования структуры поверхностно-модифицированной высокоэнтропийной, жаропрочной, износостойкой композиции TiNiZrHfCoCu-cBNCoNiAlY полученной с помощью HVOF в защитной атмосфере с последующей обработкой (термомеханическая обработка (ТМО), термическая обработка (ТО)) и оценкой механических свойств [1][2][3].…”